Hi,

among stability scalability is also an issue.
Coda Servers with more than 20Gb can probably 
be considered "large", giving ~200MB per user. 

It also depends on scenario and user skills, 
so just replacing NFS in an office environment 
is easier than supporting 100 road warriors
who need to iron out conflicts introduced by
offline work on shared files 
and can't do that themselves...

Really depends on the kind of usage.

Yours,
Steffen